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J. Perelman
"Entertaining physics". Book 2.
Chapter 9. Reflection and refraction of light. Vision

WHAT IS IT?

When looking at this picture you can hardly just guess what it depicts, "Just black mesh, nothing more," you say. But put the book upright on the table, step back, step 3 or 4 and see from there. You will see the human eye. Come closer - in front of you again see a blank grid...


Considering this grid from afar, it is easy to distinguish between her eyes and nose part of the female profile, facing right.

Of course, you will think that this is some clever "trick" inventive engraver. No, this is just a rough example of the illusions of view, which we give in whenever considered the so-called "tone" of the illustration, or "color". In books and magazines in the background always seems to be solid; but let's look at it through a magnifying glass, and you will see the same grid, which is depicted in our figure. This puzzled by your picture is nothing like increased 10 times the area of the ordinary tone illustrations. The only difference is that when the grid is small, it merges into a continuous foul already at a close distance, what we commonly hold a book while reading. When the grid is large, the merge occurs at a greater distance. The reader can easily understand everything said, if you remember our discussion regarding the angle of view.

Entertaining physics J. Perelman

 




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